Which acronym is used for a subject headings vocabulary in libraries?

• A. Library of Congress Subject Headings (LCSH)
• B. Library of Congress Classification (LCC)
• C. MAchine-Readable Cataloging (MARC)
• D. Online Public Access Catalog (OPAC)

Answer: (A)

The concept here is the standardized set of terms used to describe what a library item is about. The subject headings vocabulary used by libraries is Library of Congress Subject Headings, abbreviated for use as LCSH. This controlled vocabulary ensures consistency in how topics are described, so a single idea can be found across many items even if different authors or catalogs use different words. LCSH supports browsing and searching by linking broader, narrower, and related terms, helping users discover related materials and refine their searches.

Other options refer to different library tools or systems. Library of Congress Classification is a system for organizing shelves by subject areas, not a vocabulary of terms for describing topics. MAchine-Readable Cataloging describes the encoding standard for bibliographic records, not a subject-term list. Online Public Access Catalog is the searchable interface libraries provide for users to access their catalogs, not the vocabulary itself.